BIPN100 Sheet 1 Answers

BIPN100 Sheet 1 Answers - Patricia Pepa OH: Friday...

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Patricia Pepa OH: Friday 11-1150AM Café Roma BIPN 100: Worksheet 1 I. 3 TYPES OF DIFFUSION a. Simple Diffusion i. Diffuse directly across the phospholipid bilayer of cell ii. Lipid-soluble molecules pass 1. Examples a. Gases (O2, CO2, NO), Hormones (Steroids, Thyroids, VitD hormone, birth control, testosterone patches), Alcohol, Aspirin iii. Ficks Law of Diffusion 1. Based on 2 factors: driving force and ease of molecule flow a. From Ohms Law: V=IR I=VG i. Voltage=driving force, R=resistance, I=flux, Conductance=how easy it is for molecule to pass 2. Flux = ΔC x Area x Diffusion Coefficient a. ΔC=concentration gradient b. More area=more molecules able to permeate c. D = #channelsopen*temp/ (molecular weight^(1/2) x viscosity x thickness of membrane^2) b. Facilitated Diffusion i. Passive transport via transport proteins ii. Leak Channels: always open, based on concentration gradient iii. Gated Channels: Channel Type What’s unique about it? Example Leak Always open. Driven by
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BIPN100 Sheet 1 Answers - Patricia Pepa OH: Friday...

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